During construction of Louisville Water Company's Riverbank Filtration Tunnel, a fault zone was encountered which yielded a continuous inflow of approximately 300 gallons per minute over 60 linear feet. Through the owner's desire for the lowest practical inflow criteria and restriction of potential undesirable groundwater chemistry from the bedrock, a consolidation grouting program was designed and implemented. The consolidation grouting program had minimal impact to construction and schedule. Consolidation grouting was performed after concrete forms had passed the zone but before they were removed. This negated the need to remobilize equipment and go through additional cleanup. Consolidation grouting resulted in greater than 99 percent reduction in groundwater inflow.
Source

Ball K.,Louisville Water Company Journal - American Water Works Association | Year: 2012

Louisville Water Company (LWC) has launched an innovative riverbank filtration (RBF) project at Riverbank Filtration Tunnel and Pump Station that uses the earth as a natural filter. The utility commissioned the US Geologic Survey (USGS) to study the aquifer that runs parallel to the Ohio River and to determine the quantity and quality of the groundwater supply. A full-scale test with a demonstration collector well that would pump 15 mgd from the aquifer began operating in 1999. The demo well met and exceeded all water quality and quantity expectations, pumping an average of 17 mgd. The project also provided 60 mgd of riverbank-filtered water to the B.E. Payne Plant. The decision on the type of well to drill was based on the ease of making the connection to the tunnel. The design allowed the wells to be capped at ground level, eliminating any aboveground structures from having to be located along the river-bank.
Source

Rungvetvuthivitaya M.,University of Hawaii at Manoa | Song R.,Louisville Water Company | Campbell M.,Louisville Water Company | Ray C.,University of Hawaii at Manoa Journal of Water Supply: Research and Technology - AQUA | Year: 2014